Estate 0.65ct natural earth-mined diamond vintage old round cut 2/3 carat

Vintage / antique genuine NATURAL single diamond, very sparkly and pretty. This is an earth-mined diamond. Approximately 0.65 carat, approximately 5mm diameter, I - J color, SI - I clarity. Possibly some kind of transitional cut or early round brilliant. It is very nice and faces up white. Pictures and videos were taken on a rainy day. The diamond is more beautiful in person. Perfect for jewelry making or if you just want to own a vintage diamond. Last picture is a scrap value estimate on stone algo as of sept 24 2025. Estimated retail $2000+ in jewelry stores. Some pictures are enlarged to show details. Gray box not included This diamond has been checked by a GIA gemologist and will be verified again by poshmark’s authentication team with your purchase. vintage diamond, antique diamond, old cut diamond, oec, omc, old european, old euro, sustainable, heirloom, timeless, estate jewelry, fine jewelry, custom jewelry, art deco, edwardian, Victorian, retro, engagement ring, luxury, lux, catbird, mejuri, collectible, ooak, recycled diamond, real diamond